Section 325.5008. Definitions E and F.

(1) "Electrically grounded" means provided with an electrically conducting connection which joins the electrical circuit or equipment to the earth or to the nearest available conducting body which serves in place of the earth.

(2)     "Exposure" means the quotient of dQ by dm where dQ is the absolute value of the total charge of the ions of 1 sign produced in air when all the electrons (negatrons and positrons) liberated by photons in a volume element of air having mass dm are completely stopped in air. The special unit of exposure is the roentgen.

(3)     "Exposure rate" means the exposure per unit of time, such as R/min, mR/h.

(4)       "Facility" means the location at which 1 or more devices or sources of radiation are installed or located within 1 building or under 1 roof and are under the same administrative control.

(5)    "Field emission equipment" means equipment which uses an x-ray tube in which electron emission from the cathode is due solely to the action of an electric field.

(6)        "Filter" means material placed in the useful beam to absorb preferentially the less penetrating radiation.

(7)        "Fluoroscopic imaging assembly" means a component which comprises a reception system in which x-ray photons produce a fluoroscopic image. It includes equipment housings, electrical interlocks if any, the primary protective barrier, and structural material providing linkage between the image receptor and the diagnostic source assembly.

(8)        "Food and drug administration" or "FDA" means the United States food and drug administration established by the federal food, drug and cosmetic act of 1938, as amended, being Public Law 75-717.

History: 1954 ACS 85, Eff. Dec. 3, 1975; 1954 ACS 98 Eff. Mar 9, 1979.